Remove unused code

Author: jessealama

src/decimal128.mts

@@ -1103,18 +1103,6 @@ export class Decimal128 {
         return emitDecimal();
     }
 
-    /**
-     * Return the absolute value of this Decimal128 value.
-     *
-     */
-    private abs(): Decimal128 {
-        if (this.isNegative) {
-            return new Decimal128(this.toString().substring(1));
-        }
-
-        return this;
-    }
-
     /**
      * Compare two values. Return
      *
@@ -1493,7 +1481,7 @@ export class Decimal128 {
         }
 
         let q = this.divide(d).round(0, ROUNDING_MODE_TRUNCATE);
-        return this.subtract(d.multiply(q)).abs();
+        return this.subtract(d.multiply(q));
     }
 
     normalize(): Decimal128 {

src/rational.mts

@@ -140,9 +140,8 @@ export class Rational {
     }
 
     private static _multiply(x: Rational, y: Rational): Rational {
-        let neg = x.isNegative !== y.isNegative;
         return new Rational(
-            (neg ? minusOne : one) * x.numerator * y.numerator,
+            x.numerator * y.numerator,
             x.denominator * y.denominator
         );
     }